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40(a-1)-45(2a+1)=12(a-2)
We move all terms to the left:
40(a-1)-45(2a+1)-(12(a-2))=0
We multiply parentheses
40a-90a-(12(a-2))-40-45=0
We calculate terms in parentheses: -(12(a-2)), so:We add all the numbers together, and all the variables
12(a-2)
We multiply parentheses
12a-24
Back to the equation:
-(12a-24)
-50a-(12a-24)-85=0
We get rid of parentheses
-50a-12a+24-85=0
We add all the numbers together, and all the variables
-62a-61=0
We move all terms containing a to the left, all other terms to the right
-62a=61
a=61/-62
a=-61/62
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